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Finding the Fourth Proportional to 891.86, 1,337.18 and 480.60

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Solution

The fourth proportional to 891.86, 1,337.18 and 480.60 is: 720.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.86 : 1,337.18 = 480.60 : x
  2. Step 2: Convert to fraction form
    891.86/1,337.18 = 480.60/x
  3. Step 3: Cross multiply
    891.86x = 1,337.18 × 480.60
  4. Step 4: Simplify right side
    891.86x = 642,646.31
  5. Step 5: Solve for x
    x = 642,646.31/891.86
  6. Step 6: Final answer
    x = 720.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.